<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <title>王晓佳</title>
    <style>
      body {
        margin: 0;
        padding: 0;
        overflow: hidden;
      }

      .city {
        width: 100%;
        position: fixed;
        bottom: 0px;
        z-index: 100;
      }

      .city img {
        width: 100%;
      }
    </style>
  </head>
  <body>
      
    <canvas id="cas" style="background-color:rgba(0,5,24,1)"
      >浏览器不支持canvas</canvas
    >

    <!-- <div class="city">
      <img src="city.png" alt="" />
    </div> -->
    <img
      src="./111.png"
      alt=""
      id="moon"
      style="visibility: hidden;display: none;"
    />
    <div style="display: none;">
      <div class="shape">漫天星辰</div>
      <div class="shape">绚丽烟花</div>
      <div class="shape">祝愿你</div>
      <div class="shape">生日快乐</div>
      <div class="shape">心想事成</div>
      <div class="shape">😁😁😁</div>
    </div>
    <script>
      var canvas = document.getElementById("cas"); // 获取文档canvas
      var ocas = document.createElement("canvas"); // 创建一个新的canvas
      var octx = ocas.getContext("2d");
      var ctx = canvas.getContext("2d");
      var lastTime,
        textIndex = -1,
        startTime = new Date();
      ocas.width = canvas.width = window.innerWidth;
      ocas.height = canvas.height = window.innerHeight;
      var bigbooms = [];

      window.onload = function() {
        initAnimate();
      };

      // canvas初始化
      function initAnimate() {
        drawBg();

        lastTime = new Date();
        animate();
      }

      function animate() {
        ctx.save();
        ctx.fillStyle = "rgba(0,5,24,0.1)";
        ctx.fillRect(0, 0, canvas.width, canvas.height);
        ctx.restore();

        var newTime = new Date();
        if (newTime - lastTime > 500 + (window.innerHeight - 767) / 2) {
          var random =
            lastTime.getTime() - startTime.getTime() < 3000 ? true : false;

          var x = getRandom(canvas.width / 5, (canvas.width * 4) / 5);
          var y = getRandom(50, 200);
          if (random) {
            var bigboom = new Boom(
              getRandom(canvas.width / 3, (canvas.width * 2) / 3),
              2,
              "#FFF",
              {
                x: x,
                y: y
              }
            );
            bigbooms.push(bigboom);
          } else {
            startTime = new Date();
            var bigboom = new Boom(
              getRandom(canvas.width / 3, (canvas.width * 2) / 3),
              2,
              "#FFF",
              {
                x: canvas.width / 2,
                y: 200
              },
              document.querySelectorAll(".shape")[
                getIndex(document.querySelectorAll(".shape").length)
              ]
            );
            bigbooms.push(bigboom);
          }
          lastTime = newTime;
        }

        stars.foreach(function() {
          this.paint();
        });

        drawMoon();

        bigbooms.foreach(function(index) {
          var that = this;
          if (!this.dead) {
            this._move();
            this._drawLight();
          } else {
            this.booms.foreach(function(index) {
              if (!this.dead) {
                this.moveTo(index);
              } else if (index === that.booms.length - 1) {
                bigbooms[bigbooms.indexOf(that)] = null;
              }
            });
          }
        });

        raf(animate);
      }

      function drawMoon() {
        var moon = document.getElementById("moon");
        var centerX = canvas.width - 200,
          centerY = 100,
          width = 80;
        if (moon.complete) {
          ctx.drawImage(moon, centerX, centerY, width, width);
        } else {
          moon.onload = function() {
            ctx.drawImage(moon, centerX, centerY, width, width);
          };
        }
        var index = 0;
        for (var i = 0; i < 10; i++) {
          ctx.save();
          ctx.beginPath();
          ctx.arc(
            centerX + width / 2,
            centerY + width / 2,
            width / 2 + index,
            0,
            2 * Math.PI
          );
          ctx.fillStyle = "rgba(240,219,120,0.005)";
          index += 2;
          ctx.fill();
          ctx.restore();
        }
      }

      Array.prototype.foreach = function(callback) {
        for (var i = 0; i < this.length; i++) {
          if (this[i] !== null) callback.apply(this[i], [i]);
        }
      };

      var raf =
        window.requestAnimationFrame ||
        window.webkitRequestAnimationFrame ||
        window.mozRequestAnimationFrame ||
        window.oRequestAnimationFrame ||
        window.msRequestAnimationFrame ||
        function(callback) {
          window.setTimeout(callback, 1000 / 60);
        };

      canvas.onclick = function() {
        var x = event.clientX;
        var y = event.clientY;
        var bigboom = new Boom(
          getRandom(canvas.width / 3, (canvas.width * 2) / 3),
          2,
          "#FFF",
          {
            x: x,
            y: y
          }
        );
        bigbooms.push(bigboom);
      };

      var Boom = function(x, r, c, boomArea, shape) {
        this.booms = [];
        this.x = x;
        this.y = canvas.height + r;
        this.r = r;
        this.c = c;
        this.shape = shape || false;
        this.boomArea = boomArea;
        this.theta = 0;
        this.dead = false;
        this.ba = parseInt(getRandom(80, 200));
      };
      Boom.prototype = {
        _paint: function() {
          ctx.save();
          ctx.beginPath();
          ctx.arc(this.x, this.y, this.r, 0, 2 * Math.PI);
          ctx.fillStyle = this.c;
          ctx.fill();
          ctx.restore();
        },
        _move: function() {
          var dx = this.boomArea.x - this.x,
            dy = this.boomArea.y - this.y;
          this.x = this.x + dx * 0.01;
          this.y = this.y + dy * 0.01;

          if (Math.abs(dx) <= this.ba && Math.abs(dy) <= this.ba) {
            if (this.shape) {
              this._shapBoom();
            } else this._boom();
            this.dead = true;
          } else {
            this._paint();
          }
        },
        _drawLight: function() {
          ctx.save();
          ctx.fillStyle = "rgba(255,228,150,0.3)";
          ctx.beginPath();
          ctx.arc(
            this.x,
            this.y,
            this.r + 3 * Math.random() + 1,
            0,
            2 * Math.PI
          );
          ctx.fill();
          ctx.restore();
        },
        _boom: function() {
          var fragNum = getRandom(30, 200);
          var style = getRandom(0, 10) >= 5 ? 1 : 2;
          var color;
          if (style === 1) {
            color = {
              a: parseInt(getRandom(128, 255)),
              b: parseInt(getRandom(128, 255)),
              c: parseInt(getRandom(128, 255))
            };
          }

          var fanwei = parseInt(getRandom(300, 400));
          for (var i = 0; i < fragNum; i++) {
            if (style === 2) {
              color = {
                a: parseInt(getRandom(128, 255)),
                b: parseInt(getRandom(128, 255)),
                c: parseInt(getRandom(128, 255))
              };
            }
            var a = getRandom(-Math.PI, Math.PI);
            var x = getRandom(0, fanwei) * Math.cos(a) + this.x;
            var y = getRandom(0, fanwei) * Math.sin(a) + this.y;
            var radius = getRandom(0, 2);
            var frag = new Frag(this.x, this.y, radius, color, x, y);
            this.booms.push(frag);
          }
        },
        _shapBoom: function() {
          var that = this;
          putValue(ocas, octx, this.shape, 5, function(dots) {
            var dx = canvas.width / 2 - that.x;
            var dy = canvas.height / 2 - that.y;
            for (var i = 0; i < dots.length; i++) {
              color = {
                a: dots[i].a,
                b: dots[i].b,
                c: dots[i].c
              };
              var x = dots[i].x;
              var y = dots[i].y;
              var radius = 1;
              var frag = new Frag(
                that.x,
                that.y,
                radius,
                color,
                x - dx,
                y - dy
              );
              that.booms.push(frag);
            }
          });
        }
      };

      function putValue(canvas, context, ele, dr, callback) {
        context.clearRect(0, 0, canvas.width, canvas.height);
        var img = new Image();
        if (ele.innerHTML.indexOf("img") >= 0) {
          img.src = ele.getElementsByTagName("img")[0].src;
          imgload(img, function() {
            context.drawImage(
              img,
              canvas.width / 2 - img.width / 2,
              canvas.height / 2 - img.width / 2
            );
            dots = getimgData(canvas, context, dr);
            callback(dots);
          });
        } else {
          var text = ele.innerHTML;
          context.save();
          var fontSize = 80;
          context.font = fontSize + "px 宋体 bold";
          context.textAlign = "center";
          context.textBaseline = "middle";
          context.fillStyle =
            "rgba(" +
            parseInt(getRandom(128, 255)) +
            "," +
            parseInt(getRandom(128, 255)) +
            "," +
            parseInt(getRandom(128, 255)) +
            " , 1)";
          context.fillText(text, canvas.width / 2, canvas.height / 2);
          context.restore();
          dots = getimgData(canvas, context, dr);
          callback(dots);
        }
      }

      function imgload(img, callback) {
        if (img.complete) {
          callback.call(img);
        } else {
          img.onload = function() {
            callback.call(this);
          };
        }
      }

      function getimgData(canvas, context, dr) {
        var imgData = context.getImageData(0, 0, canvas.width, canvas.height);
        context.clearRect(0, 0, canvas.width, canvas.height);
        var dots = [];
        for (var x = 0; x < imgData.width; x += dr) {
          for (var y = 0; y < imgData.height; y += dr) {
            var i = (y * imgData.width + x) * 4;
            if (imgData.data[i + 3] > 128) {
              var dot = {
                x: x,
                y: y,
                a: imgData.data[i],
                b: imgData.data[i + 1],
                c: imgData.data[i + 2]
              };
              dots.push(dot);
            }
          }
        }
        return dots;
      }

      function getRandom(a, b) {
        return Math.random() * (b - a) + a;
      }

      var maxRadius = 1,
        stars = [];

      function drawBg() {
        for (var i = 0; i < 100; i++) {
          var r = Math.random() * maxRadius;
          var x = Math.random() * canvas.width;
          var y = Math.random() * 2 * canvas.height - canvas.height;
          var star = new Star(x, y, r);
          stars.push(star);
          star.paint();
        }
      }

      var Star = function(x, y, r) {
        this.x = x;
        this.y = y;
        this.r = r;
      };
      Star.prototype = {
        paint: function() {
          ctx.save();
          ctx.beginPath();
          ctx.arc(this.x, this.y, this.r, 0, 2 * Math.PI);
          ctx.fillStyle = "rgba(255,255,255," + this.r + ")";
          ctx.fill();
          ctx.restore();
        }
      };

      var focallength = 250;
      var Frag = function(centerX, centerY, radius, color, tx, ty) {
        this.tx = tx;
        this.ty = ty;
        this.x = centerX;
        this.y = centerY;
        this.dead = false;
        this.centerX = centerX;
        this.centerY = centerY;
        this.radius = radius;
        this.color = color;
      };

      Frag.prototype = {
        paint: function() {
          ctx.save();
          ctx.beginPath();
          ctx.arc(this.x, this.y, this.radius, 0, 2 * Math.PI);
          ctx.fillStyle =
            "rgba(" +
            this.color.a +
            "," +
            this.color.b +
            "," +
            this.color.c +
            ",1)";
          ctx.fill();
          ctx.restore();
        },
        moveTo: function(index) {
          this.ty = this.ty + 0.3;
          var dx = this.tx - this.x,
            dy = this.ty - this.y;
          this.x = Math.abs(dx) < 0.1 ? this.tx : this.x + dx * 0.1;
          this.y = Math.abs(dy) < 0.1 ? this.ty : this.y + dy * 0.1;
          if (dx === 0 && Math.abs(dy) <= 80) {
            this.dead = true;
          }
          this.paint();
        }
      };
      function getIndex(length) {
        textIndex++;
        if (textIndex >= length) {
          textIndex = 0;
        }
        console.log(textIndex);
        return Number(textIndex);
      }
    </script>
    <audio
    src="./happy_birthday2.mp3"
    autoplay
    loop
    style="display: none;"
  >
    您的浏览器不支持 audio 标签。
  </audio>    
  </body>
</html>
